#include<stdio.h>

int main()
{
    char ch;
    while(scanf("%c", &ch), ch != '@')
    {
        if(ch >= 'A' && ch <= 'Z')
            ch +=32;
        if(ch >= 'a' && ch <= 'y')
            ch +=1;
        else if(ch == 'z')//不能再写if,必须写else if
            ch = 'a';
        printf("%c", ch);            
    }
    return 0;
}